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XXXII. Exif Functions
With the exif extension you are able to work with image meta data. For
example, you may use exif functions to read meta data of pictures taken
from digital cameras by working with information stored in the headers of
the JPEG and TIFF images.
Your PHP must be compiled in with --enable-exif.
PHP does not require any additional library for the exif module. Windows
users must also have the mbstring
extension enabled.
To enable exif-support configure PHP with
--enable-exif
Windows users must enable both the php_mbstring.dll
and php_exif.dll DLL's in php.ini. The
php_mbstring.dll DLL must be loaded
before the php_exif.dll DLL so
adjust your php.ini accordingly.
Na działanie tych funcji wpływają ustawienia zawarte w pliku
php.ini.
Exif supports automatically conversion for Unicode and JIS
character encodings of user comments when module
mbstring
is available. This is done by first decoding the comment
using the specified characterset. The result is then encoded
with another characterset which should match your
HTTP output.
Tabela 1. Exif configuration options | Name | Default | Changeable | Changelog |
|---|
| exif.encode_unicode | "ISO-8859-15" | PHP_INI_ALL | Available since PHP 4.3.0. | | exif.decode_unicode_motorola | "UCS-2BE" | PHP_INI_ALL | Available since PHP 4.3.0. | | exif.decode_unicode_intel | "UCS-2LE" | PHP_INI_ALL | Available since PHP 4.3.0. | | exif.encode_jis | "" | PHP_INI_ALL | Available since PHP 4.3.0. | | exif.decode_jis_motorola | "JIS" | PHP_INI_ALL | Available since PHP 4.3.0. | | exif.decode_jis_intel | "JIS" | PHP_INI_ALL | Available since PHP 4.3.0. |
Szczegóły i definicje dotyczące stałych
PHP_INI_* znajdują się w rozdziale Dodatek H.
Oto krótkie wyjaśnienie dyrektyw
konfiguracji.
- exif.encode_unicode
string
exif.encode_unicode defines the
characterset UNICODE user comments are handled.
This defaults to ISO-8859-15 which should work for
most non Asian countries. The setting can be empty
or must be an encoding supported by mbstring. If it
is empty the current internal encoding of mbstring is
used.
- exif.decode_unicode_motorola
string
exif.decode_unicode_motorola defines
the image internal characterset for Unicode encoded user
comments if image is in motorola byte order (big-endian).
This setting cannot be empty but you can specify a list
of encodings supported by mbstring. The default is UCS-2BE.
- exif.decode_unicode_intel
string
exif.decode_unicode_intel defines
the image internal characterset for Unicode encoded user
comments if image is in intel byte order (little-endian).
This setting cannot be empty but you can specify a list
of encodings supported by mbstring. The default is UCS-2LE.
- exif.encode_jis
string
exif.encode_jis defines the
characterset JIS user comments are handled.
This defaults to an empty value which forces
the functions to use the current internal encoding
of mbstring.
- exif.decode_jis_motorola
string
exif.decode_jis_motorola defines
the image internal characterset for JIS encoded user
comments if image is in motorola byte order (big-endian).
This setting cannot be empty but you can specify a list
of encodings supported by mbstring. The default is JIS.
- exif.decode_jis_intel
string
exif.decode_jis_intel defines
the image internal characterset for JIS encoded user
comments if image is in intel byte order (little-endian).
This setting cannot be empty but you can specify a list
of encodings supported by mbstring. The default is JIS.
To rozszerzenie nie posiada żadnych rodzajów zasobów.
Poniższe stałe są zdefiniowane w tym rozszerzeniu i stają się dostępne, gdy
rozszerzenie jest dokompilowane do PHP, lub załadowane dynamicznie przy starcie.
The exif_imagetype() lists several related built-in
constants.
User Contributed Notesfilter_phpmanual at oderwat dot de
03-Sep-2005 04:26
I just found that I had to change the order of modules in php.ini to use the exif extension in php 4.3.11 on my windows system.
If I include the exif module in the order given in php.ini (first exif .. later mbstring) apache fails without any obvious reason.
After placing the exif module after the mbstring module it works.
I thought that info may prevent other people to search hours for errors in their setup too...
23-Dec-2004 11:55
exif.encode_unicode string
exif.encode_unicode defines the characterset UNICODE user comments are handled. This defaults to ISO-8859-15 which should work for most non Asian countries. The setting can be empty or must be an encoding supported by mbstring. If it is empty the current internal encoding of mbstring is used.
How come ISO-8859-15 works for most non-Asian countries? It's only for West European and does NOT work for Russian, Greek, Albanian, Polish, Czech, and so forth. The default should be 'UTF-8'
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